void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
int v9fs_uflags2omode(int uflags, int extended);
-ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
-ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64);
void v9fs_blank_wstat(struct p9_wstat *wstat);
int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
*/
static int v9fs_fid_readpage(struct p9_fid *fid, struct page *page)
{
- int retval;
- loff_t offset;
- char *buffer;
- struct inode *inode;
+ struct inode *inode = page->mapping->host;
+ struct bio_vec bvec = {.bv_page = page, .bv_len = PAGE_SIZE};
+ struct iov_iter to;
+ int retval, err;
- inode = page->mapping->host;
p9_debug(P9_DEBUG_VFS, "\n");
BUG_ON(!PageLocked(page));
if (retval == 0)
return retval;
- buffer = kmap(page);
- offset = page_offset(page);
+ iov_iter_bvec(&to, ITER_BVEC | READ, &bvec, 1, PAGE_SIZE);
- retval = v9fs_fid_readn(fid, buffer, NULL, PAGE_CACHE_SIZE, offset);
- if (retval < 0) {
+ retval = p9_client_read(fid, page_offset(page), &to, &err);
+ if (err) {
v9fs_uncache_page(inode, page);
+ retval = err;
goto done;
}
- memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval);
+ zero_user(page, retval, PAGE_SIZE - retval);
flush_dcache_page(page);
SetPageUptodate(page);
retval = 0;
done:
- kunmap(page);
unlock_page(page);
return retval;
}
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/slab.h>
+#include <linux/uio.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
int buflen;
int reclen = 0;
struct p9_rdir *rdir;
+ struct kvec kvec;
p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
fid = file->private_data;
rdir = v9fs_alloc_rdir_buf(file, buflen);
if (!rdir)
return -ENOMEM;
+ kvec.iov_base = rdir->buf;
+ kvec.iov_len = buflen;
while (1) {
if (rdir->tail == rdir->head) {
- err = v9fs_file_readn(file, rdir->buf, NULL,
- buflen, ctx->pos);
- if (err <= 0)
+ struct iov_iter to;
+ int n;
+ iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buflen);
+ n = p9_client_read(file->private_data, ctx->pos, &to,
+ &err);
+ if (err)
return err;
rdir->head = 0;
- rdir->tail = err;
+ rdir->tail = n;
}
while (rdir->head < rdir->tail) {
p9stat_init(&st);
return ret;
}
-/**
- * v9fs_fid_readn - read from a fid
- * @fid: fid to read
- * @data: data buffer to read data into
- * @udata: user data buffer to read data into
- * @count: size of buffer
- * @offset: offset at which to read data
- *
- */
-ssize_t
-v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
- u64 offset)
-{
- int n, total, size;
-
- p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
- fid->fid, (long long unsigned)offset, count);
- n = 0;
- total = 0;
- size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
- do {
- n = p9_client_read(fid, data, udata, offset, count);
- if (n <= 0)
- break;
-
- if (data)
- data += n;
- if (udata)
- udata += n;
-
- offset += n;
- count -= n;
- total += n;
- } while (count > 0 && n == size);
-
- if (n < 0)
- total = n;
-
- return total;
-}
-
-/**
- * v9fs_file_readn - read from a file
- * @filp: file pointer to read
- * @data: data buffer to read data into
- * @udata: user data buffer to read data into
- * @count: size of buffer
- * @offset: offset at which to read data
- *
- */
-ssize_t
-v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
- u64 offset)
-{
- return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
-}
-
/**
* v9fs_file_read - read from a file
* @filp: file pointer to read
v9fs_file_read(struct file *filp, char __user *udata, size_t count,
loff_t * offset)
{
- int ret;
- struct p9_fid *fid;
- size_t size;
+ struct p9_fid *fid = filp->private_data;
+ struct iovec iov = {.iov_base = udata, .iov_len = count};
+ struct iov_iter to;
+ int ret, err;
- p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
- fid = filp->private_data;
+ iov_iter_init(&to, READ, &iov, 1, count);
- size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
- if (count > size)
- ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
- else
- ret = p9_client_read(fid, NULL, udata, *offset, count);
+ p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
- if (ret > 0)
- *offset += ret;
+ ret = p9_client_read(fid, *offset, &to, &err);
+ if (!ret)
+ return err;
+ *offset += ret;
return ret;
}
void *buffer, size_t buffer_size)
{
ssize_t retval;
- int msize, read_count;
- u64 offset = 0, attr_size;
+ u64 attr_size;
struct p9_fid *attr_fid;
+ struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
+ struct iov_iter to;
+ int err;
+
+ iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buffer_size);
attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
if (IS_ERR(attr_fid)) {
retval = PTR_ERR(attr_fid);
p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
retval);
- attr_fid = NULL;
- goto error;
- }
- if (!buffer_size) {
- /* request to get the attr_size */
- retval = attr_size;
- goto error;
+ return retval;
}
if (attr_size > buffer_size) {
- retval = -ERANGE;
- goto error;
- }
- msize = attr_fid->clnt->msize;
- while (attr_size) {
- if (attr_size > (msize - P9_IOHDRSZ))
- read_count = msize - P9_IOHDRSZ;
+ if (!buffer_size) /* request to get the attr_size */
+ retval = attr_size;
else
- read_count = attr_size;
- read_count = p9_client_read(attr_fid, ((char *)buffer)+offset,
- NULL, offset, read_count);
- if (read_count < 0) {
- /* error in xattr read */
- retval = read_count;
- goto error;
- }
- offset += read_count;
- attr_size -= read_count;
+ retval = -ERANGE;
+ } else {
+ iov_iter_truncate(&to, attr_size);
+ retval = p9_client_read(attr_fid, 0, &to, &err);
+ if (err)
+ retval = err;
}
- /* Total read xattr bytes */
- retval = offset;
-error:
- if (attr_fid)
- p9_client_clunk(attr_fid);
+ p9_client_clunk(attr_fid);
return retval;
-
}
int p9_client_fsync(struct p9_fid *fid, int datasync);
int p9_client_remove(struct p9_fid *fid);
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags);
-int p9_client_read(struct p9_fid *fid, char *data, char __user *udata,
- u64 offset, u32 count);
+int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err);
int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err);
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset);
int p9dirent_read(struct p9_client *clnt, char *buf, int len,
EXPORT_SYMBOL(p9_client_unlinkat);
int
-p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
- u32 count)
+p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
{
- char *dataptr;
+ struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
- struct p9_client *clnt;
- int err, rsize, non_zc = 0;
- struct iov_iter to;
- union {
- struct kvec kv;
- struct iovec iov;
- } v;
-
- if (data) {
- v.kv.iov_base = data;
- v.kv.iov_len = count;
- iov_iter_kvec(&to, ITER_KVEC | READ, &v.kv, 1, count);
- } else {
- v.iov.iov_base = udata;
- v.iov.iov_len = count;
- iov_iter_init(&to, READ, &v.iov, 1, count);
- }
+ int total = 0;
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
- fid->fid, (unsigned long long) offset, count);
- err = 0;
- clnt = fid->clnt;
-
- rsize = fid->iounit;
- if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
- rsize = clnt->msize - P9_IOHDRSZ;
+ fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
+
+ while (iov_iter_count(to)) {
+ int count = iov_iter_count(to);
+ int rsize, non_zc = 0;
+ char *dataptr;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
- if (count < rsize)
- rsize = count;
+ if (count < rsize)
+ rsize = count;
- /* Don't bother zerocopy for small IO (< 1024) */
- if (clnt->trans_mod->zc_request && rsize > 1024) {
- /*
- * response header len is 11
- * PDU Header(7) + IO Size (4)
- */
- req = p9_client_zc_rpc(clnt, P9_TREAD, &to, NULL, rsize, 0,
- 11, "dqd", fid->fid,
- offset, rsize);
- } else {
- non_zc = 1;
- req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
- rsize);
- }
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto error;
- }
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && rsize > 1024) {
+ /*
+ * response header len is 11
+ * PDU Header(7) + IO Size (4)
+ */
+ req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
+ 0, 11, "dqd", fid->fid,
+ offset, rsize);
+ } else {
+ non_zc = 1;
+ req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
+ rsize);
+ }
+ if (IS_ERR(req)) {
+ *err = PTR_ERR(req);
+ break;
+ }
- err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
- if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
- goto free_and_error;
- }
+ *err = p9pdu_readf(req->rc, clnt->proto_version,
+ "D", &count, &dataptr);
+ if (*err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ p9_free_req(clnt, req);
+ break;
+ }
- p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
+ p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
+ if (!count) {
+ p9_free_req(clnt, req);
+ break;
+ }
- if (non_zc && copy_to_iter(dataptr, count, &to) != count) {
- err = -EFAULT;
- goto free_and_error;
+ if (non_zc) {
+ int n = copy_to_iter(dataptr, count, to);
+ total += n;
+ offset += n;
+ if (n != count) {
+ *err = -EFAULT;
+ p9_free_req(clnt, req);
+ break;
+ }
+ } else {
+ iov_iter_advance(to, count);
+ total += count;
+ offset += count;
+ }
+ p9_free_req(clnt, req);
}
- p9_free_req(clnt, req);
- return count;
-
-free_and_error:
- p9_free_req(clnt, req);
-error:
- return err;
+ return total;
}
EXPORT_SYMBOL(p9_client_read);
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff